use '?' for JOKER (blank)

From letters B, A, C, K, R, O, O, M, S  I made following words

9 letter words

backrooms[19]

8 letter words

backroom[18]

7 letter words

crambos[13]

6 letter words

brocks[14], crambo[12], combos[12], coombs[12], croaks[12], kormas[12], brooks[12], crooks[12], carbos[10], carobs[10], cobras[10], caroms[10], macros[10], karoos[10], bromos[10], brooms[10]

5 letter words

brock[13], backs[13], macks[13], smack[13], bocks[13], mocks[13], smock[13], combo[11], coomb[11], croak[11], korma[11], brook[11], crook[11], combs[11], amoks[11], makos[11], books[11], kobos[11], cooks[11], socko[11], barks[11], kbars[11], carks[11], racks[11], marks[11], borks[11], corks[11], rocks[11], carbo[9], carob[9], cobra[9], carom[9], macro[9], karoo[9], bromo[9], broom[9], ambos[9], sambo[9], camos[9], comas[9], booms[9], bosom[9], carbs[9], crabs[9], barms[9], crams[9], marcs[9], scram[9], koras[9], okras[9], corms[9], rooks[9], boars[7], boras[7], orcas[7], moras[7], roams[7], boors[7], broos[7], moors[7], rooms[7]

4 letter words

back[12], mack[12], bock[12], mock[12], comb[10], amok[10], mako[10], book[10], kobo[10], cook[10], bark[10], kbar[10], cark[10], rack[10], mark[10], bork[10], cork[10], rock[10], bask[10], kabs[10], cask[10], sack[10], mask[10], bosk[10], kobs[10], sock[10], mosk[10], ambo[8], camo[8], coma[8], boom[8], carb[8], crab[8], barm[8], cram[8], marc[8], kora[8], okra[8], corm[8], rook[8], cabs[8], scab[8], bams[8], cams[8], macs[8], scam[8], cobs[8], koas[8], oaks[8], okas[8], soak[8], mobs[8], mocs[8], sook[8], arks[8], sark[8], kors[8], boar[6], bora[6], arco[6], orca[6], mora[6], roam[6], boor[6], broo[6], moor[6], room[6], abos[6], boas[6], obas[6], soba[6], ocas[6], soca[6], moas[6], soma[6], boos[6], coos[6], moos[6], arbs[6], bars[6], bras[6], arcs[6], cars[6], scar[6], arms[6], mars[6], rams[6], bros[6], orbs[6], robs[6], sorb[6], cors[6], orcs[6], rocs[6], mors[6], roms[6], oars[4], osar[4], soar[4], sora[4]

3 letter words

kab[9], kob[9], cab[7], bam[7], cam[7], mac[7], cob[7], koa[7], oak[7], oka[7], mob[7], moc[7], abo[5], boa[5], oba[5], oca[5], moa[5], boo[5], coo[5], moo[5]